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Full text of "The Morphology And Evolution Of The Apes And Man"

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THE CHIMPANZEES.    (Anthropopithrcns:*
(Fig. 1C.)
Configuration. The Chimpanzee is a powerful, heavily-built animal, but its bulk is not so great as that of the Orang or the Gorilla. The male mar attain the length of five feet from the crown to the heels, but the female is smaller. The limbs are more nearly equal than in the other Apes. The forearm is longer than the arm, and the hand than the foot. The hand constitutes more than 25 per cent, of the upper extremity.
The head is compressed, with a flattened vertex. The supra-orbital crests are well marked, but are not so prominent as those in the Gorilla. The nose is flattened, and has a slight bridge ; and it is encircled by a narrow groove in the upper lip. The lips are long and thick, and are bulged forwards by the prognathous jaws. The chin is receding. The neck is short.
The skin of the face is more or less pigrnented, and the intensity of the colour varies at different ages; so it is not a character which can be relied on for taxonomic purposes.
The external ear is large, and stands out from the side of the head like a wind-sail. It is usually pale in colour. It is neither hairy, nor is it concealed by long tresses as in the Orang and Gorilla. It varies in character in different animals, and sometimes the two ears are different in the same animal. The margin of the ear is only folded in its upper part, and there is no trace of Darwin's tubercle. The tragus and antitragus are well marked, and are separated by a deep fossa. Superiorly the helix is continuous with the antihelix,